<template>
  <div class="channel-edit">
    <!-- 我的频道 -->
     <van-cell :border="false" >
       <div slot="title" class="title-text">我的频道</div>
      <van-button class="edit-btn"
        type="danger"
        plain
        round
        size="mini"
        @click="isEdit = !isEdit"
        >{{ isEdit ? '完成' : '编辑'}}</van-button>
    </van-cell>
     <!-- 宫格 -->
     <van-grid  class="my-grid" :gutter="10">
      <van-grid-item
        class="grid-item"
        v-for="(channel, index) in myChannels"
        :key="index"
        icon="clear"
        @click="onMyChannelClick(channel, index)"
      >
      <van-icon
      v-show="isEdit && !fiexChannels.includes(channel.id)"
      slot="icon"
      name="clear"
      ></van-icon>
      <span
       class="text"
      slot="text"
      :class="{ active: index === active}"
      >{{channel.name}}</span>
      </van-grid-item>
    </van-grid>

    <!-- 频道推荐 -->
    <van-cell :border="false">
      <div slot="title" class="title-text">频道推荐</div>
    </van-cell>
    <!-- 宫格 -->
    <van-grid class="recommend-grid"  :gutter="10">
      <van-grid-item
        class="grid-item"
        v-for="(channel, index) in recommendChannels"
        :key="index"
        icon="plus"
        :text="channel.name"
        @click="onAddChannel(channel)"
      />
    </van-grid>
  </div>
</template>

<script>
import { getAllChannels, addUserChannel, deleteUserChannel } from '@/api/channel.js'
import { mapState } from 'vuex'
import { setItem } from '@/utils/storage.js'
export default {
  name: 'ChannelEdit',
  components: {
  },
  props: {
    myChannels: {
      type: Array,
      required: true
    },
    active: {
      type: Number,
      required: true
    }
  },
  data () {
    return {
      allChannels: [],
      isEdit: false,
      fiexChannels: [0]
    }
  },
  computed: {
    ...mapState(['user']),
    recommendChannels () {
      const channels = []
      this.allChannels.forEach(channel => {
        const ret = this.myChannels.find(myChannels => {
          return myChannels.id === channel.id
        })
        if (!ret) {
          channels.push(channel)
        }
      })
      return channels
    }
  },
  watch: {},
  created () {
    this.loadAllChannels()
  },
  mounted () {},
  methods: {
    async loadAllChannels () {
      try {
        const { data } = await getAllChannels()
        this.allChannels = data.data.channels
      } catch (err) {
        this.$toast('获取数据失败')
      }
    },
    async onAddChannel (channel) {
      this.myChannels.push(channel)
      if (this.user) {
        try {
          await addUserChannel({
            id: channel.id,
            seq: this.myChannels.length
          })
        } catch (err) {
          this.$toast('保存失败,请稍后重试')
        }
      } else {
        setItem('TOUTIAO_CHANNELS', this.myChannels)
      }
    },
    onMyChannelClick (channel, index) {
      if (this.isEdit) {
        if (this.fiexChannels.includes(channel.id)) {
          return
        }
        if (index <= this.active) {
          this.$emit('update-active', this.active - 1, true)
        }
        this.myChannels.splice('index', 1)

        this.deleteChannel(channel)
      } else {
        this.$emit('update-active', index, false)
      }
    },

    async deleteChannel (channel) {
      try {
        if (this.user) {
          await deleteUserChannel(channel.id)
        } else {
          setItem('TOUTIAO_CHANNELS', this.myChannels)
        }
      } catch (err) {
        this.$toast('操作失败,请稍后重试')
      }
    }
  }
}
</script>

<style scoped lang="less">
.channel-edit {
  padding: 85px 0;

  .title-text {
    font-size: 32px;
    color: #333333;
  }

  .edit-btn {
    width: 104px;
    height: 48px;
    font-size: 26px;
    color: #f85959;
    border: 1px solid #f85959;
  }

  /deep/ .grid-item {
    width: 160px;
    height: 86px;
    .van-grid-item__content {
      white-space: nowrap;
      background-color: #f4f5f6;
      .van-grid-item__text, .text {
        font-size: 28px;
        color: #222;
        margin-top: 0;
      }
      .active {
        color: red;
      }
      .van-grid-item__icon-wrapper {
        position: unset;
      }
    }
  }

  /deep/ .my-grid {
    .grid-item {
      .van-icon-clear {
        position: absolute;
        right: -10px;
        top: -10px;
        font-size: 30px;
        color: #cacaca;
        z-index: 2;
      }
    }
  }

  /deep/ .recommend-grid {
    .grid-item {
      .van-grid-item__content {
        flex-direction: row;
        .van-icon-plus {
          font-size: 28px;
          margin-right: 6px;
        }
      }
    }
  }
}

</style>
